Guided wave materials

BEESON ET AL. Organic Polymers as Guided Wave Materials... 

We have presented a review of the salient features of nonlinear integrated optics. It appears that nonlinear organic materials can play an important role in second- and third-order guided-wave devices. This field requires a great deal of material characterization and processing, however, before significant advances are realized. 

Guided-Wave-Tube Technique for Materials Characterization... 

Two of the advantages of using such materials are flexibility in the fabrication of optical structures and the tailoring of optical properties through material engineering. For application in guided-wave nonlinear optical devices high optical quality and low dielectric constant are but two of the requisite properties. 

The speed of electro-optic devices is greatly determined by the dielectric properties of the electro-optic material. For instance, the bandwidth per modulating power (A//P) of a guided-wave lumped-element modulator is given by ... 

New spectrophotometers are designed around optical fibers with wide spectral ranges (0.2-1 or 3 pm) and modular. The spectrometer from Guided Wave is already used in process control (batch). However, its design with spectral scanning and a photomultiplier makes it more similar to an analytical instrument than to a unit for plant process control. It can be associated with twelve optically multiplexed channels. The DTC 1000 spectrophotometer [34] called Spectrofip (Photonetics Society) was recently developed for remote control of nuclear materials (0.4-0.95 pm) with a resolution of 0.6 nm. It is of the video spectrometer type with photodiode arrays (1728). A spectrum is obtained in 10 ms and the minimum time between each measurement is about 0.5 s. It is an ideal device for... 

An important concern is two-photon absorption which can also become a significant problem at high power densities, especially in the guided wave geometry. These excitations are even more of a problem in multiple quantum well devices and quantum confined structures because direct two-photon absorption can create free carriers which decay very slowly, giving rise to a slow nonlinear response. Molecular and polymeric materials offer additional flexibility to shift the two-photon resonances by chemical modifications. 

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